Examine source code of Content Section Blocker

{
  "manifest_version": 3,
  "name": "Content Section Blocker",
  "version": "1.1",
  "description": "Force-hide any element by CSS selector (class or id). Rules are editable and stored locally, per-site or globally.",
  "browser_specific_settings": {
    "gecko": {
      "id": "element-blocker@jirugutema",
      "strict_min_version": "115.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "Content Section Blocker",
    "default_icon": {
      "16": "icons/icon-16.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "permissions": [
    "storage",
    "activeTab",
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ]
}